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Chris Hobson

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Chris Hobson last won the day on January 24

Chris Hobson had the most liked content!

About Chris Hobson

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    Grand Master
  • Birthday 09/02/1968

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    5kVa Mecer/Axpert inverter and 12 250W Yingli panels

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  1. Mecer 5kVa settings and monitoring

    I have changed from Lead Acid batteries to Lithium batteries. Pylontech has 48V modules that one connects in series so there no way of attaching a HA02 and secondly the Pylontech has its own Battery Management System (BMS) and so a HA02 is superfluous. Heat is a battery's nemesis. Batteries age twice as fast at 30°C compared to 25°C. So you can be very conservative and have shallow discharges and still your batteries are not going to last long. It was one of the motivating factors for going over to Lithium Ferrous Phosphate as temperature only has a marked effect on the batteries above 50°C
  2. Mecer 5kVa settings and monitoring

    HA01 only balances two 12V batteries HA02 balances 4 batteries connected in series. Voltage for batteries between 2.4V and 12V. HA02 cheaper and more versatile. Therefore I would recommend HA02. email your details, phone number and , address to reception@unipos.co.za. Say you got the details here at powerforum and you will be sent a proforma invoice for the HA02
  3. Axpert 5 kVA patched firmware 72.70c

    There are two version's of Coulomb's firmware. One for LiFePO4 and one for other chemistries (Lead Acid, Lead Crystal etc.) That is unusual. I have seen the MPPT reset but this only that a couple of seconds
  4. Sabre prepaid meters

    I am going to phone you
  5. Axpert 5 kVA patched firmware 72.70c

    Hi Shiggi Welcome to the forum. It does have Lithium Iron support and has a dynamic charging algorithm that is dependent on communication between your BMS and the Axpert. One does not equalise Lithium cells but rather rely on the BMS to either top or bottom balance.
  6. Questions before buying

    A reputable inverter from a reputable company no problems that I can see. So long as the various bits of extra kit SPDs disconnects change over switch etc are installed the extras are not excessive. Kudos to your mate on checking on pricing. The rest of us ploughed ahead and then toted up the final figure.
  7. Sabre prepaid meters

    HI we are about to start a project in a municipality that owes Eskom a LOT of money. It would appear the town will be without electricity twice a day for 3 hours at a stretch. This scenario is likely to continue for several years. Most of our potential clients have Sabre E-SA 015 prepaid meters. Does anyone have experience with this meter?
  8. Newbie mistakes on first solar install

    Yes the HA02 can pass up to 10A. One needs to remember that often the voltage imbalance between batteries is in tens of millivolts so really not a lot of power is being transferred. A 40W fan may make the HA02 work quiet hard
  9. Pairing AGM and Gel batteries

    The recommendation is that you use batteries that are of the same size, manufacture, age and chemistry. Due to practical considerations sometimes one ends up mixing batteries of different ages (replacing a dud battery for instance) or mixing batteries of different capacity 232Ah and 236Ah from the same manufacturer (the difference is essentially minimal). I would however never mix batteries from different manufacturers or different chemistries.
  10. Which batteries should I buy (rhetorical question)

    Hi Tersius Once you have ironed out your install perhaps we could ask you to give us your opinion on the FreedomWon modules. There are lots of folk who are looking to make the change and the lithium market is nearly as diverse as the lead acid market.
  11. HI Chris

    Not sure if it is appropriate to ask you on this forum?

    Will the LG Chem 6.5kWh Lithium Battery  work with Mecer Hybrid 5kVA/4kW 48V?

    Thanks Harry

    1. Chris Hobson

      Chris Hobson

      Hi Harry I have sent you a PM


  12. DIY Powerwall with 18650 batteries

    This is not quite true. Each chemistry has its own thermal runaway The earliest Lithium chemistry was Lithium cobalt and has a thermal runaway temp of 150°C . This low thermal runaway temperature, poor cycle life and the high cost of cobalt has resulted in this chemistry being replace by blending manganese with other active materials for the cathode Lithium manganese oxide was one of the first replacements of lithium cobalt with a thermal runaway of 250°C. Like lithium cobalt rapid charging can lower this figure. It also suffers from a shorter cycle life. Lithium Ferrous Phosphate with a thermal runaway of 270°C can safely be stored fully charged. It has excellent cycle life and is one of the safest chemistries. With a max charging voltage of 3.65V it does not have the same energy density of other lithium chemistries but that is not a major factor in the solar industry. Lithium Nickel cobalt aluminium oxide shares many characteristics of lithium cobalt but is cheaper and has a longer cycle life Thermal runaway is also about 150°C Lithium nickel manganese cobalt oxide (NMC) is one of the newer cobalt blends results in lowering of costs and better safety (thermal runaway of 210°C ) making it a favoured chemistry of the electric car industry. Lithium Titanate no thermal runaway problems and has a high cycle life but cost are high and is largely limited to the electric car industry.
  13. DC Circuit Breakers

    My partner in crime (Chris-R) is about to import good quality solar accessories (SPDs, DC disconnects, DC (and AC) breakers, fuses, MC4 connectors cabling etc). Watch this space .
  14. need help finding Full schematics for pip 4048

    Hi Kiore PM your e-mail address and I will send you what I have. Have a look at the Aussie AEVA site (go to the lounge) there is an incredibly long PIP 4048 thread where Coulomb and Weber often post portion of the schematics.
  15. Water harvesting and use, same logic as solar systems.

    I like your Dad's thinking Just an observation. We have about 150 000l storage of rainwater on the farm and in my father's time was used for washing clothes, hot water, and drinking. It is the Karoo and we don't get a lot of rain so if you have enough storage you can go a long way. We have scaled back as one of the subterranean tanks has a crack in it. I am too big to fit through the manhole and my staff are too scared to climb down and see. Maybe I should hire one of the Sibanye miners to help. After being trapped for 24 hours my little predicament would be child's play. In a more modern setup in Graaff-Reinet the owner put in several large underground tanks under the lawn in the garden and he and collects rainwater. He is virtually self sufficient and solar too so he really was planning ahead.